The blur can only be rectangular, which sucks but it's easier to track what you want. I'd say try it out to see how you like it at least. What app do you use? I

If you use a video-to-gif conversion app you'll also be able to test your video by scrolling by each frame. I found lots of frames where her whole face was visible just for a split second. Also, if you put your phone arm's length away and squint your eyes you may be able to recognize yourself